Self-preloading shift lever

ABSTRACT

An exemplary shift lever includes a mounting assembly, a flexible member coupled to the mounting assembly, and an interface coupled to the flexible member. The flexible member is resilient so as to provide a selected biasing force at a predetermined deformation angle, and flexible enough to elastically deform across a selected angular range. The mounting assembly is configured for connection with the input shaft of a transmission, and the interface is configured for connection with an output of a drive selector.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the benefit of U.S. Provisional Application No.61/890,817, filed Oct. 14, 2013, which is incorporated herein byreference in its entirety.

TECHNICAL FIELD

The present invention generally relates to transmission shift levers,and more particularly, but not exclusively, to shift levers fortransmissions having dog-clutches.

BACKGROUND

Transmissions of small utility vehicles often utilize a dog-clutchassembly operable to adjust the configuration of the transaxle. To shiftgears, a user adjusts the position of a dogged shifting gear within thetransmission by actuating a shifter handle. Transmissions of this typecan only shift into gear when the dogs of the shifting gear and thedriving gear are properly aligned. If the dogs are misaligned (a stateoften referred to as dead-head), the shifting gear cannot move intoengagement with the driving gear.

Conventional shifting systems utilizing dog-clutches suffer from avariety of limitations and disadvantages, such as those relating toshifting gears when the transmission is dead-headed. For example, whenthe dogs are not aligned, the user must continue to apply force to theshifter handle until the dogs become aligned. Once the dogs becomealigned, the force provided by the user causes the shifting gear to moveinto engagement with the driving gear, and the user can stop applyingforce to the shifter handle. There is a need for the unique andinventive gear-shifting apparatuses, systems and methods disclosedherein.

SUMMARY

An exemplary shift lever includes a mounting assembly, a flexible membercoupled to the mounting assembly, and an interface coupled to theflexible member. The flexible member is resilient enough to provide aselected biasing force at a predetermined deformation angle, andflexible enough to elastically deform across a selected angular range.The mounting assembly is configured for connection with the input shaftof a transmission, and the interface is configured for connection withan output of a drive selector.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1a is a perspective illustration of a shift lever according to anembodiment of the invention.

FIG. 1b is a perspective illustration of an exemplary coupling between ashift lever and a transmission input shaft.

FIG. 2 is a schematic illustration of a shifting system including adrive-shifting assembly according to an embodiment of the invention.

FIGS. 3-7 depict the drive-shifting assembly in various states ofoperation.

DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS

For the purposes of promoting an understanding of the principles of theinvention, reference will now be made to the embodiments illustrated inthe drawings and specific language will be used to describe the same. Itwill nevertheless be understood that no limitation of the scope of theinvention is thereby intended. Any alterations and further modificationsin the described embodiments, and any further applications of theprinciples of the invention as described herein are contemplated aswould normally occur to one skilled in the art to which the inventionrelates.

With reference to FIG. 1a , an exemplary shift lever 20 according to anembodiment of the invention is depicted connecting a transmission inputshaft 10 to a drive selector push/pull cable 30. The shift lever 20includes a mounting assembly 21 configured for connection with the inputshaft 10, a flexible member 22, and an interface 23 configured forconnection with the push/pull cable 30. One end of the flexible member22 is coupled to the mounting assembly 21, and the other end of theflexible member 22 is coupled to the interface 23.

The exemplary mounting assembly 21 includes a base portion 211, a firstarm 212 facing the base portion 211, and a second arm 213 extending fromthe base portion 211. The first arm 212 is spaced apart from the baseportion 211, such that a channel 214 is defined therebetween. Thechannel 214 is configured to receive the input shaft 10, which may besecured to the mounting assembly 21 by fasteners (see FIG. 1 b)extending through openings 215 in the base portion 211 and the first arm212. While the illustrated channel 214 is defined by substantiallyparallel walls (i.e. the base member 211 and the first arm 212), theconfiguration of the base member 211, the first arm 212, and the channel214 may of course vary depending upon the geometry of the input shaft10. During assembly, the flexible member 22 is sandwiched between thesecond arm 213 and a plate 216, and the mounting assembly 21 is coupledto the flexible member 22 by fasteners such as rivets 217, which securethe flexible member 22 between the second arm 213 and the plate 216.

Turning briefly to FIG. 1 b, a non-limiting exemplary form of couplingan input shaft 10′ to the mounting assembly 21 is depicted. Theillustrated coupling includes a bolt 14 extending through the channel214, a protrusion 15 extending through the openings 215 and coupled tothe input shaft 10′, and a nut 18 axially retaining the bolt 14. Theprotrusion 15 includes a concave surface 16 configured for engagementwith the bolt 14. When the bolt 14 is positioned in the cavity 214between the curved surface of the mounting assembly 21, relative motionof the input shaft 10′ and the mounting assembly 21 is substantiallyprevented.

Returning to FIG. 1a , the flexible member 22 is illustrated in anatural (i.e. undeformed) state. While the exemplary flexible member 22is substantially planar in the natural state, other forms are alsocontemplated. For example, the natural state of the flexible member 22may include curvilinear surfaces in certain embodiments. The flexiblemember 22 is configured to elastically deform from its natural state inresponse to relative movement of the mounting assembly 21 and theinterface 23. That is to say, if the push/pull cable 30 causes theinterface 23 to move while the input shaft 10 retains the mountingassembly 21 in place, the flexible member 22 will bend to a deformedstate. In the deformed state, the flexible member 22 provides a biasingtorque which urges the mounting assembly 21 and the interface 23 toreturn to the relative positions corresponding to the natural state ofthe flexible member 22.

The flexible member 22 is resilient enough to provide a selected biasingforce at a predetermined angle of deformation, and flexible enough toelastically deform across a selected angular range. As described infurther detail below, the biasing force, deformation angle, and angularrange depend upon characteristics of the system in which the shift lever20 is to be utilized. The flexible member 22 may be formed of any numberof materials which provide the desired characteristics. For example, theflexible member 22 may be formed of a composite material such asfiberglass, or a spring steel such as blue tempered AISI 1095 springsteel.

The flexible member 22 includes a first portion 221 adjacent to themounting assembly 21 and a second portion 223 adjacent to the interface23. In the illustrated embodiment, the first portion width w₂₂₁ isgreater than the second portion width w₂₂₃, and the flexible member 22tapers inward from the first portion 221 to the second portion 223. Aswith other features of the shift lever 20, the precise geometry of theresilient member 22 may be customized according to the needs of aparticular application. For example, in certain embodiments, the secondportion width w₂₂₃ may greater than the first portion width w₂₂₁, or thefirst portion width w₂₂₁ and the second portion width w₂₂₃ may be thesame or substantially similar.

The interface 23 includes a base portion 231 and an arm 232 having anopening 234 by which the cable 30 can be attached to the interface 23.While the illustrated interface 23 is configured for attachment to thecable 30, the interface 23 may be of another form, for example if theoutput of the drive selector is a rigid member. During assembly, theflexible member 22 is sandwiched between the base portion 231 and aplate 236, and the interface 23 is coupled to the flexible member 22 byfasteners such as rivets 237, which secure the flexible member 22between the base portion 231 and the plate 236. In certain embodiments,the portion of the flexible member 22 between the base portion 231 andthe plate 236 may include extensions having openings through which thefasteners extend.

While the illustrated flexible member 22 is coupled to the mountingassembly 21 and the interface 23 as described above, other forms ofcoupling are also contemplated. For example, the mounting assembly 21and/or the interface 23 may be molded or die-cast onto the flexiblemember 22, thereby eliminating the rivets 217, 237 and reducing the partcount. In other forms, one or both of the mounting assembly 21 and theinterface 23 may be integrally formed with the flexible member 22, forexample as a molded composite.

As illustrated in FIG. 1a , the mounting assembly 21 and the interface23 are connected only by the flexible member 22, such that all torquetransmitted between the input shaft 10 and the cable 30 is alsotransmitted to the flexible member 22. The inventive shift lever 20 canthus include fewer parts than a rigid shift lever having a separatebiasing member. As will be appreciated by those having skill in the art,reduced part counts are often desirable, as there are fewer points ofpotential failure.

With reference to FIG. 2, an exemplary shifting system 40 includes adrive selector 50 operatively coupled to a drive-shifting assembly 100.The drive selector 50 includes an input crank 52, which is rotationallycoupled to an output crank 54 by a shaft 56. The drive-shifting assembly100 is configured to adjust the configuration of a transmission 101, andincludes an input shaft 110 of the transmission 101, a flexible shiftlever 120 coupled to the input shaft 110, a push-pull cable 130connected to the output crank 54, and an interface 140 coupling theshift lever 120 to the cable 130. The coupling of the input shaft 110,shift lever 120, and cable 130 may be similar to that described withreference to FIGS. 1a and 1 b, or may be of another form. In certainembodiments, the drive-shifting assembly 100 may further include alimiting member 150 constraining the range of motion of the shift lever120. The limiting member can be any mechanism known to those skilled inthe art such as one or more abutment members extending into a path oftravel of the shift lever 20.

During operation of the system 40, a user rotates the input crank 52(for example by applying a force to a shifter knob or handle), therebycausing the output crank 54 to rotate accordingly. Rotation of theoutput crank 54 extends or retracts the push/pull cable 130 in thedirection indicated by the arrows 132, which in turn adjusts theposition of the interface 140. The drive selector 50 is operable in aplurality of discrete positions; when in one of the discrete positions,the drive selector 50 resists rotation therefrom. Thus, when a userselects a gear by adjusting the drive selector 50 to one of the discretepositions, the drive selector 50 will remain in that position until theuser applies a force sufficient to overcome the resistive force. Thedrive selector 50 may be of the type disclosed in the commonly-ownedco-pending application entitled DRIVE SELECTOR (filed Oct. 14, 2013 asU.S. Provisional Patent Application No. 61/890,842), although otherforms are also contemplated. Because the position of the interface 140corresponds to that of the output crank 54, adjusting the drive selector50 to one of the discrete positions causes the interface 140 to beretained in a corresponding position.

The transmission 101 comprises a portion of a vehicle's drive train, andis operable to adjust the configuration of a transaxle 300. Thetransmission 101 can be used to transmit power from a prime mover suchas an electric motor or an internal combustion engine and the like tothe drive train of a vehicle. Various forms of vehicles can utilize theexemplary shifting 40 and transmission 101 system defined in the presentapplication. Exemplary vehicles can include, but are not limited toutility vehicles such as those of the type made or sold by Club Car,LLC. The exemplary utility vehicles can be for personal or commercialpurposes and can include land based vehicles or water based vehiclessuch as golf carts and in-board powered boats or the like.

As is known in the art, a user can select a gear configuration for thetransmission 101 by actuating the input shaft 110 that can be connectedto a dog clutch 310. The dog clutch 310 is operable with first andsecond dog selector gears 312, 314 schematically shown in component 318.In one form the dog selector gears 312, 314 include a forward gear and areverse gear. In other forms the selector gears can be a pair of forwardgears or alternatively a pair of reverse gears. The dog clutch 310, andthe gears 312, 314 include a plurality of dogs 320 associated therewith.The dog clutch 310 is moveable between the gears 312, 314 as representedby double arrow 330. Rotation of the input shaft 110 moves the dogclutch 310 with respect to the dogged selector gear which is coupled toa driven shaft (not shown) and a dogged driving gear which is coupled toa driving shaft (not shown). When the dogs 320 of the clutch are alignedand engaged with the dogs of one of the gears 312, 314, rotary motioncan be transmitted from the driving shaft to the driven shaft in theselected manner. If, however, the dogs are not properly aligned (that isto say, if the transmission is dead-headed), the gears cannot engage,and the input shaft 110 becomes locked. As a result, the input shaft 110will not rotate to the desired position, and the transmission 101 willnot shift into gear until the dogs 320 become aligned.

With additional reference to FIG. 3, the illustrated transmission 101 isa Forward-Neutral-Reverse transmission operable in Forward, Neutral, andReverse modes when the input shaft 110 is in the corresponding Forward,Neutral, or Reverse position 110 _(F), 110 _(N), 110 _(R), respectively.It is also contemplated that the transmission 101 may be operable inadditional or alternative modes corresponding to additional oralternative positions of the input shaft 110. For example, in certainembodiments, the transmission 101 may be operable in a low gear ratio ina first position of the input shaft 110, and a higher gear ratio in asecond position of the input shaft 110.

The shift lever 120 is of the type described with reference to FIG. 1a ,and may be substantially similar to the shift lever 20. Like theabove-described shift lever 20, the shift lever 120 includes a flexiblemember configured to elastically deform across an elastic deformationrange. The shift lever 120 includes a first end coupled to the inputshaft 110, and a second end coupled to the cable 130 via the interface140. The coupling of the first end and the input shaft 110 substantiallyprevents the first end from rotating or pivoting with respect to theinput shaft 110. The coupling of the second end and the cable 130 at theinterface 140 is such that extending or retracting the cable 130 resultsin movement of the interface 140 and actuation of the shift lever 120.

The illustrated cable 130 is a push/pull cable configured to transmitforce in opposing directions 132. As described above, the selectorsystem 50 is operable to retain the cable 130 in one of a plurality ofdiscrete positions, which in turn retains the interface 140 in aForward, Neutral, or Reverse position 140 _(F), 140 _(N), 140 _(R).While the cable 130 is depicted as a straight line, it is to beunderstood that the cable 130 may of course be flexible, so long as itis capable of transmitting force in both forward and backwarddirections. In certain embodiments, the output crank 54 may be connectedto the interface 140 by an element other than the cable 130, such as arigid connection member.

Under ideal operating conditions, the input shaft 110 is free to rotateto a new position, and movement of the interface 140 results in rotationof the input shaft 110 and the shift lever 120. For example, movementfrom the Neutral interface position 140 _(N) or similar fashion to theReverse positions 110 _(R) or 120 _(R) to the Forward interface position140 _(E) causes the input shaft 110 and the shift lever 120 to alsorotate from Neutral positions 110 _(N), 120 _(N) to Forward positions110 _(F), 120 _(F). If the transmission 101 is in the dead-head state,however, the input shaft 110 becomes locked as described above. For easeand convenience of description, the input shaft 110 is describedhereinafter as being locked in one of the Forward, Neutral, and Reversepositions 110 _(F), 110 _(N), 110 _(R). It is to be understood, however,that the input shaft 110 may rotate from these positions, and onlybecome locked as it approaches another of the positions. For example,while the following description refers to the input shaft 110 as beinglocked in the Neutral position 110 _(N), the input shaft 110 may rotatefrom the Neutral position 110 _(N), and become locked in a positioncloser to the Forward or Reverse position 110 _(F), 110 _(R).

FIG. 4 illustrates the drive-shifting assembly 100 with the transmission101 locked in the Neutral mode. Because the input shaft 110 cannotrotate from the Neutral position 110 _(N), movement of the interface 140causes the shift lever 120 to elastically deform. For example, the shiftlever 120 bends to a Forward deformed state 120 _(FD) in response to theForward interface position 140 _(F), and bends to a Reverse deformedstate 120 _(RD) in response to the Reverse interface position 140 _(R).Due to the resilient nature of the shift lever 120, this deformationresults in a preloading torque which urges the input shaft 110 towardthe appropriate position.

In embodiments which include a limiting member 150, the limiting member150 constrains the range of motion of the shift lever 120, preventingpermanent deformation of the flexible member. While the limiting member150 is illustrated as a constraining ring, other forms are alsocontemplated. For example, the limiting member of certain embodimentsmay include rigid arms extending from the input shaft 110 or the end ofthe shift lever 120 coupled to the input shaft 110.

FIGS. 5 and 6 depict the drive-shifting assembly 100 at various stagesof an exemplary shifting process. The input shaft 110 is initiallylocked in the Neutral position 110 _(N), and is shifted to the Forwardposition 110 _(E) as a result of the process. One having skill in theart will readily understand that similar stages occur when the inputshaft 110 is initially locked in one of the positions, and is shifted toan adjacent position (for example from the Forward position 110 _(E) tothe Neutral position 110 _(N)).

As illustrated in FIG. 5, the shift lever 120 and the interface 140begin in the Neutral positions 120 _(N), 140 _(N) (depicted in phantom).As the user adjusts the drive selector 50 from its Neutral position toits Forward position 50 _(F), the cable 130 transmits a force 134 _(F)urging the interface 140 toward the Forward position 140 _(F). Becausethe input shaft 110 cannot rotate to its Forward position 110 _(F), theshift lever 120 bends to the Forward deformed state 120 _(FD), resultingin a preloading torque T ₁₂₀. The Forward deformed state 120 _(FD) isoffset from the natural state of the shift lever 120 (in this case, theNeutral position 120 _(N)) by a deformation angle θ_(D). The deformationangle θ_(D) corresponds to an angle between a position of the inputshaft 110 in which the dogs are fully mated and a position of the inputshaft 110 in which the dogs prevent rotation of the input shaft 110.

The magnitude of the preloading torque T ₁₂₀ depends upon a number offactors, including the deformation angle θ_(D) and the effective springconstant of the shift lever 120. As will be appreciated by those havingskill in the art, the spring constant of the shift lever 120 alsodepends upon a number of factors, including the material andconfiguration of the flexible member. Thus, given the deformation angleθ_(D), the preloading torque T ₁₂₀ can be made sufficient to rotate theinput shaft 110 by selecting appropriate material and configuration forthe shift lever 120.

FIG. 6 illustrates the drive-shifting assembly 100 after the user hasmoved the drive selector 50 to the Forward position 50 _(F). Alsodepicted (in phantom) are the Neutral input shaft position 110 _(N), theForward deformed shift lever position 120 _(FD), and the preloadingtorque T ₁₂₀. As described above, the drive selector 50 is configured toremain in a selected discrete position (in this case, the Forwardposition 50 _(F)) until the user provides a force sufficient to move thedrive selector 50 from the previously-selected discrete position.Because the drive selector 50 cannot move from the Forward position 50_(F), the interface 140 cannot move from the Forward position 140 _(F),and the shift lever 120 continues to apply the torque T ₁₂₀ to the inputshaft 110 without further action by the user. The torque T ₁₂₀ preloadsthe dogs, ensuring that the shifting gear and the driving gear engageonce the dogs align.

As rotation of the transaxle brings the dogs into alignment, the inputshaft 110 again becomes free to rotate. When this occurs, the preloadingtorque T ₁₂₀ causes the input shaft 110 to rotate to the Forwardposition 110 _(F) as the shift lever 120 transitions from the Forwarddeformed state 120 _(FD) to the Forward position 120 _(F). Once theinput shaft 110 is in the Forward position 110 _(F), the shifting anddriving gears are engaged, and the transmission 101 operates in theForward mode. As can be seen from the foregoing, the resilient nature ofthe shift lever 120 and the selective retention by the drive selector 50enables the system 40 to preserve the user's intended gear-setting, evenwhen the transmission 101 will not shift into the selected gear.

FIG. 7 depicts the drive-shifting assembly 100 with the input shaft 110locked in the Forward position 110 _(E) due to misalignment of the dogs.If the user attempts to shift directly from Forward to Reverse (i.e.before the input shaft 110 can rotate to the Neutral position 110 _(N)),the force 134 _(R) transmitted through cable 130 _(R) will cause theinterface 140 will move to the Reverse position 140 _(R) while the inputshaft 110 remains in the Forward position 110 _(F). This causes theshift lever 120 to bend to a Reverse deformed state 120 _(RD)′, which isoffset from the Forward position 120 _(E) by a deformation angle θ_(D)′.Because this is the most deformation possible in the illustrateddrive-shifting assembly 110, the deformation angle θ_(D)′ can beconsidered a maximum deformation angle θ_(max).

The shift lever 120 of the illustrated embodiment is flexible enough tobend to the highly deformed state 120 _(RD)′ without plasticdeformation. As with the spring constant, the flexibility of the shiftlever 120 depends upon a number of factors, including the material andconfiguration of the flexible member. Thus, given the maximumdeformation angle θ_(max) for a particular drive-shifting assembly 100,the shift lever 120 can be provided with a corresponding elasticdeformation range by selecting appropriate material and configuration.The elastic deformation range required for a particular shift lever 120may of course vary according to a number of factors. For example, inembodiments in which the input shaft 110 is operable across a broadangular range, the shift lever 120 may be more flexible than embodimentsin which the input shaft 110 is operable across a narrower angularrange.

Returning to FIG. 1a , the shift lever 20 operates in a manner analogousto that described above with respect to FIGS. 2-7. When a user selects anew gear with the drive selector, the cable 30 moves the interface 23with respect to the mounting assembly 21. This movement causes rotationof the shift lever 20 and/or deformation of the flexible member 22. Ifthe dogs in the transmission are properly aligned, the shift lever 20rotates and the input shaft 10 moves to the selected position; if thetransmission is dead-headed, the flexible member 22 deforms elastically,creating a preloading torque. When the drive selector is in one of thediscrete positions, the cable 30 retains the flexible member 22 in thedeformed state, and the shift lever 20 continues to apply the preloadingtorque to the input shaft 10. Once the transaxle begins spinning and thedogs become aligned, the input shaft 10 rotates to the selected positionas the flexible member 22 returns to its natural state.

While FIG. 1a illustrates an exemplary form of the shift lever 20, thedesign parameters of the inventive shift lever are scalable. That is tosay, the length and form of the shift lever 20 can be altered toaccommodate the preload a particular transmission requires for shifting.For each application, the shift lever 20 may be customized to have aspring rate sufficient to shift the transmission, and to ensure thatflexible member 22 does not suffer permanent deformation in even themost severe cases of over-flexure (as described with respect to FIG. 7).

In one aspect the present disclosure includes an apparatus comprising: atransmission having an associated dog clutch; a rotatable input shaftconnected to the dog clutch; a shift lever having a unitary flexiblemember extending between first and second ends, the shift lever operablycoupled to the input shaft at the first end; a drive selector operablycoupled to the second end of the shift lever; and wherein the driveselector is movable between first and second positions and the unitaryflexible member elastically deforms through a predetermined anglecorresponding to the first and second positions when the dog clutch isout of alignment.

Refining aspects include an apparatus wherein the unitary flexiblemember generates a preload on the input shaft when deformed at thepredetermined angle; wherein the preload of the unitary flexible memberrotates the input shaft when the dog clutch moves into alignment;wherein rotation of a transaxle of the transmission brings the dogclutch into alignment; further comprising an abutment to limit thetravel of the second end of the flexible member; wherein the maximumdeflection of the flexible member is limited by a pair of abutments;wherein the flexible member is formed from one of a composite, a metalor combinations thereof; wherein the flexible member includes a taperedwall; and wherein the flexible member is non-planar in an unloadednatural state.

In another aspect the present disclosure includes a system comprising: avehicle with a transmission having at least two gear outputs; a dogclutch operable with the transmission, wherein the dog clutch includestwo opposing clutch members with a plurality of dogs formed thereon andwherein the transmission can only shift gears when the dogs are aligned;a rotatable input shaft connected to the dog clutch; a shift leverhaving a unitary flexible member extending between first and secondends, the shift lever operably coupled to the input shaft at the firstend; a drive selector operably coupled to the second end of the shiftlever; and wherein the drive selector is movable between first andsecond positions and the unitary flexible member elastically deformsthrough a predetermined angle corresponding to the first and secondpositions when the dogs are misaligned.

Refining aspects include a system, wherein the at least two gear outputsinclude a forward gear and a reverse gear; wherein the at least two gearoutputs include a neutral gear and a plurality of forward and reversegears; wherein the elastically deformed flexible member generates apreload torque to rotate the input shaft after the dogs move intoalignment, wherein rotation of a transaxle brings the dogs intoalignment; wherein the flexible member and an interface is a singlemolded composite structure; wherein the flexible member includesnonlinear portions in an unloaded natural state; wherein the flexiblemember includes non-symmetrical portions about at least one imaginaryplane extending therethrough in an unloaded natural state; and whereinthe vehicle includes land based and water based vehicles.

Another aspect of the present disclosure includes method comprising:moving a shift lever from a first position to a second position;deflecting a unitary flexible member in response to the moving when adog clutch is misaligned; rotating the transaxle to align the dogclutch; rotating an input shaft with a preload force of the deflectedflexible member after the dog clutch is aligned; and shifting atransmission into a different gear in response to the rotating of theinput shaft.

Refining aspects include a method further comprising constraining thedeflecting to a maximum predetermined angle; and wherein theconstraining includes at least one abutment extending into a pathway ofa movable member.

While the invention has been illustrated and described in detail in thedrawings and foregoing description, the same is to be considered asillustrative and not restrictive in character, it being understood thatonly the preferred embodiments have been shown and described and thatall changes and modifications that come within the spirit of theinventions are desired to be protected. It should be understood thatwhile the use of words such as preferable, preferably, preferred or morepreferred utilized in the description above indicate that the feature sodescribed may be more desirable, it nonetheless may not be necessary andembodiments lacking the same may be contemplated as within the scope ofthe invention, the scope being defined by the claims that follow. Inreading the claims, it is intended that when words such as “a,” “an,”“at least one,” or “at least one portion” are used there is no intentionto limit the claim to only one item unless specifically stated to thecontrary in the claim. When the language “at least a portion” and/or “aportion” is used the item can include a portion and/or the entire itemunless specifically stated to the contrary.

What is claimed is:
 1. An apparatus comprising: an input crank havingfirst and second ends; a user handle connected to the first end of theinput crank; a pivot shaft connected to the second end of the inputcrank; an output crank extending from the pivot shaft; a push-pull cableconnected to the output crank; a transmission having an associated dogclutch; a rotatable input shaft connected to the dog clutch; a shiftlever having a unitary flexible member extending between first andsecond ends, the shift lever operably coupled to the input shaft at thefirst end and to the push-pull cable at the second end; and wherein thepush-pull cable is movable between first and second positions and theunitary flexible member transmits all torque load between the push-pullcable and the input shaft and the unitary flexible member elasticallydeforms through a predetermined angle corresponding to the first andsecond positions when the dog clutch is out of alignment.
 2. Theapparatus of claim 1, wherein the unitary flexible member generates apreload on the input shaft when deformed at the predetermined angle. 3.The apparatus of claim 2, wherein the preload of the unitary flexiblemember rotates the input shaft when the dog clutch moves into alignment.4. The apparatus of claim 1, wherein rotation of a transaxle of thetransmission brings the dog clutch into alignment.
 5. The apparatus ofclaim 1, further comprising an abutment to limit the travel of thesecond end of the flexible member.
 6. The apparatus of claim 1, whereinthe maximum deflection of the flexible member is limited by a pair ofabutments.
 7. The apparatus of claim 1, wherein the flexible member isformed from one of a composite, a metal or combinations thereof.
 8. Theapparatus of claim 1, wherein the flexible member includes a taperedwall.
 9. The apparatus of claim 1, wherein the flexible member isnon-planar in an unloaded natural state.
 10. A system comprising: avehicle with a transmission having at least two gear outputs; a dogclutch operable with the transmission, wherein the dog clutch includestwo opposing clutch members with a plurality of dogs formed thereon andwherein the transmission can only shift gears when the dogs are aligned;a rotatable input shaft connected to the dog clutch; a shift leverhaving a unitary flexible member extending between first and secondends, the shift lever operably coupled to the input shaft at the firstend; a drive selector operably coupled to the second end of the shiftlever, wherein the drive selector includes: a user input crank coupledto a pivot shaft; an output crank extending from the pivot shaft; and apush-pull cable connected to the output crank; and wherein the driveselector is movable between first and second positions and the unitaryflexible member is configured to transmit all torque load between thedrive selector and the rotatable input shaft such that the unitaryflexible member elastically deforms through a predetermined anglecorresponding to the first and second positions when the dogs aremisaligned.
 11. The system of claim 10, wherein the at least two gearoutputs include a forward gear and a reverse gear.
 12. The system ofclaim 10, wherein the at least two gear outputs include a neutral gearand a plurality of forward and reverse gears.
 13. The system of claim10, wherein the elastically deformed flexible member generates a preloadtorque to rotate the input shaft after the dogs move into alignment. 14.The system of claim 10, wherein rotation of a transaxle brings the dogsinto alignment.
 15. The system of claim 10, wherein the flexible memberand an interface is a single molded composite structure.
 16. The systemof claim 10, wherein the flexible member includes nonlinear portions inan unloaded natural state.
 17. The system of claim 10, wherein theflexible member includes non-symmetrical portions about at least oneimaginary plane extending therethrough in an unloaded natural state. 18.The system of claim 10, wherein the vehicle includes land based andwater based vehicles.
 19. A method comprising: moving an input crank;pivoting an output crank about a pivot in response to the moving of theinput crank; moving a push-pull cable in response to the pivoting of theoutput crank; moving a shift lever from a first position to a secondposition with the push-pull cable; deflecting a unitary flexible memberin response to the moving when a dog clutch is misaligned; rotating thetransaxle to align the dog clutch; rotating an input shaft with apreload force of the deflected flexible member after the dog clutch isaligned; and shifting a transmission into a different gear in responseto the rotating of the input shaft.
 20. The method of claim 19, furthercomprising constraining the deflecting to a maximum predetermined angle.21. The method of claim 20, wherein the constraining includes at leastone abutment extending into a pathway of a movable member.